Percentage of observations where the VFR minimums for ceiling and visibility are met: visibility of 5 mi or more and a ceiling of 3,000 ft or more. Only observations between sunrise and sunset are taken into account.
Marginal VFR conditions (%)
Month
Average
2024
2023
2022
2021
2020
January
98.9
99
100
100
100
97
February
98.7
100
100
100
98
96
March
99.5
100
98
99
100
100
April
99.6
100
100
100
99
May
99.9
100
100
100
100
June
99.5
100
97
100
100
July
99.8
100
100
100
100
August
99.8
99
100
100
100
September
99.6
99
100
100
100
October
99.7
100
100
100
99
November
96.8
97
100
100
100
December
98.4
98
93
100
100
Average
99.3
99.4
99.3
99.3
99.6
99.2
Marginal VFR conditions or better during daylight period
Percentage of observations where the MVFR minimums for ceiling and visibility are met: visibility of 3⅛ mi or more and a ceiling of 1,000 ft or more. Only observations between sunrise and sunset are taken into account.
Maximum temperatures (°C)
Month
Average
2024
2023
2022
2021
2020
January
10.2
11
10
11
10
10
February
12.9
15
12
12
14
13
March
17.5
17
16
18
18
18
April
23.4
24
25
23
23
May
28.2
28
30
28
30
June
32.6
33
31
33
34
July
34.5
38
34
32
35
August
33.2
34
31
32
35
September
29.7
31
30
30
28
October
22.4
25
20
23
25
November
15.1
16
13
18
15
December
10.1
11
10
13
8
Average
21.2
14.2
23.0
22.1
22.7
23.2
Average highest temperature per day
The maximum temperature is typically observed some hours after noon.
Minimum temperatures (°C)
Month
Average
2024
2023
2022
2021
2020
January
-5.8
-2
-4
-6
-5
-4
February
-3.1
0
-3
-6
-3
-2
March
1.5
3
1
0
1
3
April
5.3
4
6
6
6
May
10.7
11
11
11
12
June
15.6
15
18
17
15
July
19.1
22
19
19
19
August
17.5
19
17
17
17
September
14.0
15
14
15
12
October
6.4
8
7
5
9
November
-1.6
1
-4
0
3
December
-4.4
-3
-3
-3
-5
Average
5.5
7.1
6.0
6.6
7.2
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
1.8
3
0
1
0
5
February
3.0
1
1
1
4
9
March
1.9
2
3
2
1
3
April
1.2
0
0
2
2
May
0.8
1
0
0
1
June
1.8
0
6
4
1
July
0.3
0
1
0
0
August
1.4
3
3
0
0
September
1.3
2
1
1
1
October
1.2
1
4
1
1
November
1.6
2
0
0
0
December
1.5
1
2
2
1
Average
1.5
1.8
1.2
1.5
1.2
1.7
Precipitation during daylight period
Percentage of observations with observed rain, drizzle, snow or hail. Only observations between sunrise and sunset are taken into account.
Wind speed (knots)
Month
Average
2024
2023
2022
2021
2020
January
5.4
6
7
4
5
6
February
7.2
7
8
6
7
6
March
8.3
8
10
7
9
8
April
7.9
8
10
8
7
May
7.8
7
9
8
7
June
6.8
8
6
6
7
July
5.3
6
5
5
5
August
5.1
6
5
5
4
September
4.9
5
4
5
4
October
6.0
6
5
6
4
November
4.8
4
6
3
6
December
5.1
4
5
5
5
Average
6.4
7.0
6.5
6.1
6.0
6.1
Average wind speed
Excluding wind gusts. Only observations between sunrise and sunset are taken into account.
Prevailing wind direction
Month
2024
2023
2022
2021
2020
January
272°
269°
325°
285°
340°
February
248°
252°
222°
261°
275°
March
245°
238°
253°
243°
213°
April
258°
249°
230°
253°
May
193°
225°
196°
211°
June
232°
254°
156°
204°
July
179°
195°
181°
260°
August
186°
149°
180°
230°
September
182°
179°
209°
221°
October
196°
259°
255°
041°
November
321°
215°
348°
240°
December
323°
267°
237°
345°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.